/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.queryengine.plan.relational.planner.optimizations;

import com.google.common.collect.Range;

import static java.util.Objects.requireNonNull;

public class Cardinality {
  private final Range<Long> cardinalityRange;

  public Cardinality(Range<Long> cardinalityRange) {
    this.cardinalityRange = requireNonNull(cardinalityRange, "cardinalityRange is null");
  }

  public boolean isEmpty() {
    return isAtMost(0);
  }

  public boolean isScalar() {
    return Range.singleton(1L).encloses(cardinalityRange);
  }

  public boolean isAtLeastScalar() {
    return isAtLeast(1L);
  }

  public boolean isAtMostScalar() {
    return isAtMost(1L);
  }

  public boolean isAtLeast(long minCardinality) {
    return Range.atLeast(minCardinality).encloses(cardinalityRange);
  }

  public boolean isAtMost(long maxCardinality) {
    return Range.closed(0L, maxCardinality).encloses(cardinalityRange);
  }
}
